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                [Usaco2004 Dec]Cow Ski Area雪场缆车                </h1>
                <p>时间限制：1s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;约翰的表哥罗恩生活在科罗拉多州．他近来打算教他的奶牛们滑雪，但是奶牛们非常害羞，</span></div>
<div><span style="font-size: medium">不敢在游人如织的度假胜地滑雪．没办法，他只好自己建滑雪场了．罗恩的雪场可以划分为W列L行(1&le;W&le;500;1&le;L&le;500)，每个方格有一个特定的高度H(O&le;日&le;9999)．奶牛可以在相临方格间滑雪，而且不能由低到高滑．&nbsp;&nbsp;&nbsp;&nbsp;为了保证任意方格可以互通，罗恩打算造一些直达缆车．缆车很强大，可以连接任意两个方格，而且是双向的．而且同一个方格也可以造多台缆车．但是缆车的建造费用贵得吓人，所以他希望造尽量少的缆车．那最少需要造多少台呢？</span></div></p><hr/><h3>输入格式</h3><p><div><span style="font-size: medium">&nbsp;&nbsp;第1行：W，L．</span></div>
<div><span style="font-size: medium">&nbsp;&nbsp;接下来输入宽W高L的矩阵地图．</span></div></p><hr/><h3>输出格式</h3><p><div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;最小的缆车数．</span></div></p><hr/><h3>样例输入</h3><pre>9 3
1 1 1 2 2 2 1 1 1
1 2 1 2 3 2 1 2 1
1 1 1 2 2 2 1 1 1</pre><hr/><h3>样例输出</h3><pre>3

    把左下角作为(1，1)，建(3，1)H(8，2)，(7，3)H(5，2)，(1，3)H(2，2)三部缆车．这样任意两个方格间可以互通．
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Gold</p>
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